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一、什么是命题? 所谓命题,即数学上的一个判断。既是判断,就只有“肯定’和“否定”两种形式。无法进行肯定或否定的,就不能称为命题。如“我正在说慌”因为无法判定它的真假,就不是命题。此外,命题还具有确定性。即命题对象的最小外延(命题对象的大前提)不能改变。二、命题的分类命题依质可分为肯定命题和否定命题。用肯定形式叙述的命题,称为肯定命题,如“2是偶数”即是。用否定形式叙述的命题,称为否定命题,如“3不是偶数”即是。命题依量可分为全称命题和特称命题。全称命题涉及命题对象的全体,命题中有全称词“凡”、“都”、
First, what is the proposition? The so-called proposition, that is, a mathematical judgment. As far as judgments are concerned, there are only two forms of “affirmation” and “negation.” Without affirmation or negation, it cannot be called a proposition, such as “I am being panicked” because it cannot be judged whether it is true or false, it is not a proposition. The proposition is also deterministic, that is, the minimum extension of the propositional object (the premise of the propositional object) cannot be changed.Secondly, the propositional propositions of propositions can be divided into positive propositions and negative propositions.The propositions in affirmative form are called affirmative propositions. For example, “2 is an even number” is a proposition that is stated in a negative form, and is called a negative proposition, such as “3 is not an even number”, that is, the proposition can be divided into a full-title proposition and a special proposition proposition.The propositional proposition involves the subject of the proposition. All of the propositions have the full name “Where” and “All”.